lift differential that exists between the advancing main rotor blade and the retreating rotor blade is known as?
Dis-symmetry of lift
to maintain the desired hovering altitude (no wind conditions ) you must?
change the amount of main rotor thrust
Density altitude at sea level is
29.92 inHg (inches of mercury) at 15 degrees C
What is created by the motion of an airfoil through the air
when departing behind a heavy aircraft the pilot should avoid wake turbulence by maneuvering the helicopter
Above and upwind from the heavy aircraft
What actions should you take if engine failure occurs at altitude?
lower the collective pitch control to maintain rotor RPM
during a hover, a helicopter tends to drift right. to compensate for this some helicopters?
rotor mast is rigged to the left side
if the rpm is low and manifold pressure is high what initial corrective action should be taken?
lower the collective pitch
high air speeds especially in turbulent air should be avoided because the possibility of ?
the retreating blade to stall in forward flight, stalls are more likely to occur under conditions of high gross weight, low rpm, high density altitude, steep or abrupt turns, and or turbulent flight.
translation lift is the result of?
during surface taxi the collective pitch is used to control?
the rate of speed. the higher the collective pitch the higher the taxi speed.
the upward bending of the rotor blades resulting from the combination of lift and centrifugal forces is known as
the tail rotor produces thrust and is variable through the use of ?
anti torque pedals
medium frequency vibrations would be associated with
defects in tail rotor
while in cruise level flight, low frequency vibrations (100-400 cycles per minute) are usually associated with?
always associated with the main rotor
a stall is the results of ?
exceeding the angle of attack
What is ground effect ?
the result of interference of the surface
the primary purpose of the tail rotor system is to ?
counteract the torque effect of the main rotor
the most effective method of scanning for other aircraft for collision avoidance during daylight hours is to use ?
a series of short regularly spaced eye movements that bring successive areas of the sky into the central visual field each movement should not exceed 10 degrees and each area should be observed for at least one second to enable detection
translation lift is the result of ?
increased rotor efficiency
in a no wind condition, which control is used to change heading?
a helicopter that is improperly loaded with a CG forward of forward limits will ?
have a nose low altitude need excessive rearward displacement of the cyclic to maintain hover
the wind conditions that requires the most caution when avoiding wake turbulence on landing is
light tail winds because they can move the vortices of a preceding aircraft forward into the anticipated touch down zone of another
when operating at high forward air speeds, retreating blade stall are more likely to occur under which conditions?
high gross weight, low rpm, high density altitude, steep or adrupt turns, and or turbulent flight
to initiate a quick stop ?
aft the cyclic and simultaneously lower the collective pitch
if possible when departing from a defined area what type of take off is preferred?
a normal take off from a hover should be made in confined areas
under what conditions should a pilot consider using a running take off?
when gross weight or density altitude prevents a sustained hover at normal hovering altitude. this is often referred to as high density altitude takeoff
ground effect is most likely to result in what
becoming airborne before reaching appropriated speeds.
what action would be appropriate for confined area operations ?
plan a flight path over an area suitable for a forced landing
ground resonance is most likely to develop when?
a series of shocks causes the rotor system to become unbalanced ie hard contact with one skid
lift is the upward thrust created by ?
airflow as it passes around an airfoil
during a hover a helicopter tends to drift in the direction of tail rotor thrust. this is called?
translating tendency or drift.
take off from a slope in a helicopter with skid type landing gear is normally accomplished by ?
bring the helicopter to a level altitude before completing leaving the ground
the proper procedure for a slope landing in a helicopter with skid type landing gears is ?
when parallel to the slope slowly lower the up slope skid to the gound prior to lowering the down slope skid .
the combination of factors that will reduce helicopter performance the most is ?
high altitude high temperature and high humidity
the most favorable conditions for helicopter performance are the combination of ?
low density altitude light gross weight and moderate to strong winds
an indicated airspeed of 80 mph at 5000 feet is actually a true airspeed of approximately?
88 add 2 percent of airspeed for each 1000 feet to the given air speed.